Mixing valve for gases



April 14, 1925. 1,533,904

- T. w. SAUNT MIXING VALVE FOR GASES Filed Aug. 4 1924- vwanliozPatented Apr. 14, 1925.

THOMAS 'wILrrnEnsAUnr, or mieH-Ion-sE-A; ENGLAND/I'V- H-IKING VALVEFOReases."

A plication xfiled August 4, 1924. serial ammonia.

To all whom it may concern.

-Be it known that'l, Trroarns WVILLrnnn SAUNT, :a subject of the King"of Great Britain, residing at Lei'gh-xon-Sea, Essex, England, haveinvented new and useful 1mprovements in Mixing Valvesfor Gases,

of which the following isa specification.

This invention relates to carburettors for providing the necessaryexplosive mixture of fuel vapourrand air, forsupply :to internalcombustion engines.

My improved carburettor is of the type wlhereln there is a piston.movlng in a cylinder having itsaxls transverse to a thoroughfare atoneend of which the air isadmitted and at the other end thecombustibleymixture passes to the induction pipe of the engine, the.fuel being :admitted through ,a

transverse inlet passage arranged on the opposite side of thethoroughfare "to. the

piston, the end of the piston opposite to the :fuel inlet being maderhollow or recessed. Such carburettors have heretofore been used onlywith liquid fuel, such :as petrol, :supplied as a mixture ofliquidzspray with air through a comparatively large bore'of: shortlength closed at the bottom by :a spraying device.

The object of my invent-ion is to produce a carburettor adapted for useWith a gaseous fuel produced by the vaporization of petroleum or likeheavy oil.

In the accompanying drawing,

Figure 1 is a vertical central section, and

Figures 2 and 3 are transverse sect-ions on the line 2-2 and 3-3respectively, of Figure 1, showing a carburettor constructed accordingto my invention.

A is the vaporizer-outlet, which is provided with a flange B to receivethe flanged fuel inlet C of the carburettor that is secured in positionby a nutD. The vaporizer may be of the form described in thespecification of my application for Letters Patent No. 557302, and is inthe present drawing indicated in broken lines, 6 being the vaporizer, 7a float chamber controlling the paraiiin supply to the vaporizer, and 5the burner which effects the evaporation.

The carburettor casing comprises an airinlet branch E, which is enlargedinwards at the bottom and extends to a sleeve F, that fits into acylindrical branch Gr arranged coaxially with the fuel inlet C and issecured in position by a cover plate H. The sleeve F has a portion ofits circumference cut away inlet pipe I.

at its lower end toform a port J which is arranged adjacent the :airinlet branch and also has a a circular port K diametrically oppositesaid cut-away portion for the ot-m let iof the zrnixture of :fuel andair, the port 5K being. arranged substantially above or 'at't-he levelof the outletof the fuel vapour lower end of the sleeve F rests on Lilcounter plate L having: an upwardly extending cylindrical flangeL thatfits into the sleeve and serves to centre the same. "T lieicounterplatemay be .made selectively interchangeable with their counter-platesfhaving flanges of different heights, if found desirable for the bettercontrol of .the :mixture by the throttle valve. "The counterplate Lrests on a flange I on the fuel vapour inlet pipe I, and has a "borethat fits loosely over Esuch pipe. Inthe sleeve F there slides a pistonM, the lower end of which is recessed at N to assist .lIl forming an aircushion to receive the hot fuel vapour from the vaporizer outlet A. Bythis means, condensation "of the vaporized fuel by coming into directcontact with metal surfaces at a lower temperature is prevented. As thelower end of Q the bore of which is of such diameter as to leave a smallamount of clearance between its inner'wall and the rod O. By this meansany lack of alignment between the rod; 0 and the bore of the sleeve F isautomatically compensated for; The rod 0 is guided by means of anexternally screwthreaded sleeve R, which fits into a correspondinglyscrew threaded socket S in the cover plate H and is secured in anydesired position by means of a lock nut T, so as to limitthe travel ofthe piston. M in an up ward direction.

A drain passa-geV is provided in the lowermost part. of the air inlet Eto carry off from the sump so formed any oil that may be drawn throughthe vaporizer into the carburettor in a liquid state.

The longer portion of the y W is a float chamber provided with a v whenthe engine is not running. Such addi-.

tion of water to the explosive mixture has been found to preventpreignition and to improve the combustion of the fuel in the enginecylinder. Y is the out-let for the mixture of fuel vapour and air, suchoutlet being connected to the induction pipe of the engine in a knownmanner. By the construction shown, the sleeve F can be readily exchangedfor another having ports'J, K of different sizes and shapes, so as toenable the carburettor to be adjusted to engines of different powers, orto limit-the speed of an engine if required. Moreover since the fuelvapour inlet pipe or nozzle I is held in position by'the sleeve F, suchpipe may be readily interchanged for a new one or for one of differentsize when required.

By arranging the portJ at a low level in the air-inlet E, as shown, itis possible to ensure that the maximum quantity of air shall sweepacross the inlet pipe or nozzle I for the gaseous fuel.

Moreover a blanking ring or perforated means of a ring 4 held againstthe inlet branch by studs and screws.

The improved carburettor enables a properly proportioned mixture to beobtained throughout. the entire range of travel of the piston fromclosed to full throttle opening. The control is by. the-throttle alonewhichcan be operated from the accelerator of the vehicle in any suitableknown manner.

I claim 2- 1 A casing comprising a conduit adapted for connection at oneend to an engine intake and open at the other end to the atmosphere, aninlet for vaporized fuel extending into said conduit transversely of thebore thereof, a cylindrical sleeve extending across said conduitco-axially of said fuel inlet, said sleeve being formed with. an openingin that side adjacent the end of the conduit which is adapted 1 to beconnected to the engine intake, and withan arcuate port in the oppositeside extending part way around said sleeve, the upper edge of said portterminating. substantially at the upper edge of said fuel inlet, and aplunger-type throttlevalve operable within said sleeve.

THOMAS \VILLFRED SAUNT.

lVitness:

Hamurr J. BAvEns'rocK.

